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nvme: add nvme_get_ns_head()

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Add a wrapper for getting a reference to the NS head.

This would be used in scenarios when we know that getting a reference
would not fail.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
John Garry 2026-07-13 10:42:37 +00:00 committed by Keith Busch
parent 29261f8bb4
commit a11e0a4cb4
3 changed files with 7 additions and 1 deletions
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5
drivers/nvme/host/core.c
View File

@ -693,6 +693,11 @@ static void nvme_free_ns_head(struct kref *ref)
kfree(head);
}
void nvme_get_ns_head(struct nvme_ns_head *head)
{
kref_get(&head->ref);
}
bool nvme_tryget_ns_head(struct nvme_ns_head *head)
{
return kref_get_unless_zero(&head->ref);

2
drivers/nvme/host/multipath.c
View File

@ -797,7 +797,7 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
set_bit(GD_SUPPRESS_PART_SCAN, &head->disk->state);
sprintf(head->disk->disk_name, "nvme%dn%d",
ctrl->subsys->instance, head->instance);
nvme_tryget_ns_head(head);
nvme_get_ns_head(head);
return 0;
}

1
drivers/nvme/host/nvme.h
View File

@ -995,6 +995,7 @@ int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
void nvme_queue_scan(struct nvme_ctrl *ctrl);
int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi,
void *log, size_t size, u64 offset);
void nvme_get_ns_head(struct nvme_ns_head *head);
bool nvme_tryget_ns_head(struct nvme_ns_head *head);
void nvme_put_ns_head(struct nvme_ns_head *head);
int nvme_cdev_add(const char *name, struct cdev *cdev,